Definition of pure substances and mixtures

Pure substances: Pure substances are defined as substances that are made of only one type of atom or only one type of molecule.

Properties of pure substances

Properties of pure substances are listed below

  • Pure substances are mostly homogeneous in nature comprising of only one type of atoms or molecules.
  • These substances mainly have a constant or similar composition throughout.
  • The substances have fixed boiling and melting points.
  • A pure substance usually engages in a chemical reaction to form predictable products.

Mixture: A mixture is a combination of two or more pure substances in which each pure substance retains its individual chemical properties. Mixtures are further divided into a homogenous or heterogeneous mixture.

Homogenous mixtures: A homogeneous mixture occasionally called a solution, is comparatively unvarying in configuration or constant. Every unit of the mixture is like every other unit.

Heterogenous mixture: A heterogeneous mixture is a concoction whose configuration varies from spot to spot within the sample.

Properties of mixtures

Properties of mixtures are listed below

  • It does not have any specific properties, the properties of the mixture are a result of the average properties of all the constituents.
  • It is formed as a result of a physical change.
  • They have a variable composition.
  • Their melting and boiling points differ.

Note: Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.

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